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Two pressures are measured for a blood pressure reading 1  : Systolic blood pressure is a measure of blood pressure while the heart is beating. 2  Diastolic pressure is a measure of blood pressure while the heart is relaxed.
If you mean what causes the systolic to be high while the diastolic is normal or low the answer is hardening of the arteries. Normally as the pulse of blood comes through the â¦ artery the walls stretch to accommodate the wave of blood.n example of how to read a blood pressure measurement is 120 mmHg/80 mmHg or 120 over 80. High blood pressure in adults is defined as having either a systolic pressure of 140 mmHg or more, or having a diastolic pressure of 90 mmHg or more.